I thought I had motors figured out. After some reviewing I'm missing something.
Anyone wanna help?
All conductors are THW 75*C terminations.
25hp, 25hp, 15hp, 5hp
208V three phase
w/ non-time-delay fuse.
What is the Feeder fuse size?
This is how I think the problem is done but Its not Im missing something.
Take the largest motor FLC @ 125% = 93.5A
Get the fuse size for 93.5A = 100A
Now add that 100A with the FLC of the remianing motors.
100
74.8
46.2
+ 16.7
= 237.7A
Round down and the Feeder fuse should be 225A
Thats wrong, apparently the answer is 350A Feeder Fuse.
Help me out here I'm missing something. Thanks.
Last edited by Trick440; 06/13/07 09:07 PM.
